Acidified KMnO_4 is decolourised by:

JEE Main Chemistry question

Acidified KMnO is decolourised by:

(A)Oxygen
(B)Hydrogen
(C)Nitric oxide
(D)Nascent hydrogenCorrect

Answer: (D)

Solution

Decolourisation of acidified KMnO requires a reducing agent capable of reducing Mn to Mn. Nascent hydrogen, being freshly generated and highly reactive, is a far more effective reducing agent for this

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Question ID VK-137378